Drawing-instrument



(No Model.) l`

E. L. SA1\IDERSO1\I.` DRAWING INSTRUMENT.

10.523333 'PatentgqJuly 31, 1394. l

WSW@ M+@ Amm/vers.

YH: clams PETERS co.. PHOTO-LINO.. WASHINGTON. c,

A l l UNITEDSTATES' PATENT Gratos.

EDMUNDy L. sANDERsoN, oF

DRAWING-INSTRUMENT.

vwAiTHAM, MAssAoHIsETTs.

SPECIFIGATIN forming part of Letters Patent No. saavsadatea July 31,1894.l Application filed .nine 1'7, 1893. semina l.tf/ 8.601. (No moan.)

To @ZZ whom 5mn/,y concern.' r Be it known that I, EDMUNDL. SANDERsoN,

of Waltham, in the county of Middlesex and State of Massachusetts, haveinvented a new and Improved Drawing-Instrument, of which Ythe followingis a full, clear, and exact de# soription.

The invention relatesfto drawing instruments, and its object is toprovide a new and improved adjustable triangle, which is 'simple anddurable in construction, and arranged to permit of conveniently drawinglines at any angle to the T-square, and also lines perpendicularto eachother.

The inventionconsists of an adjustable triangle comprising' a straightedgeand a blade pivoted thereon.

Th'einvention also consists of certain parts and details andcombinations of the same, as will be fully described hereinafter andthen pointedfut in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a plan view of the improvement. Fig. 2 isa cross section ofthe same on the line 2-2 of Fig. 1. Fig. 3 is an enlarged face view ofpart of the clamping device. Fig. 4 is lan enlarged side elevation, withparts in section, of the clamping device, showing the several membersdisconnected. Fig. 5 is a plan view of the improvement in a differentposition from that shown in Fig. 1. Fig. 6 is a similar view of amodified form of the'improvement. Fig. 7,is a like view of anothermodified form of the improvement; and Fig. 8 is a similar viewv of stillanother modified form of the improvement.

The improved drawing instrument as illustrated in Figs. 1, 2, and 5 witha straight edge A, and with a lug 'B, in which is arranged a pivot C,connecting the lug B with an arm D, projecting from the base of aright-angle blade E in the form of a triangle as is plainly shown in thefigures referred to. The blade E is adapted to be secured or clamped inplace on a protractor G, riveted or otherwise fastened on the straightedge A, and having its center in the center of the pivot C. The clampingdevice F which is l used for this purpose is provided with a head F',conptersunk in the back of the blade E and provided with a threadedshankF2 on engage the protractor G at the inner edge thereof, 'as is plainlyillustrated in Fig. 2. A nut F4 screws on the outer end of the threadedshank F2 to press the clamping plate F3 firmly `in contact with theprotractor G. In order ing, I provide the head F with a pin ,F5 adaptedto engage an apertureF6 in the saidv clamping plate F3. On the blade Eissecured a pointer H indicating on the graduation of theprotraotor G.

The ends of the straight edge A are preferably beveled, as illustratedin the drawings, and the lug B preferablyA forms part of the base of theprotractor G, as shown in Figs. l, 5 and 6, so that the blade E isarranged in the same plane as the straight edge A. Now it will be seenthat when the nut F4 of the clamping device F is loosened, the blade EAcan be moved in any desired position, so as to bring its outer edgeeither in a parallel position relative to the straight edge A, as shownin Fig. 1, or in a right-angular position to the saidl straight edge, asillustrated in Fig. 5. When. the blade E is in the position shown inFig. 5, then the operator can draw vertical lines on one edge of thevblade and horizontal lines on the upper edge of the said blade, and

Fig. 1, the angular lines drawn along the edges ofthe blade slant at anangle of forty-five ydegrees to the straight edge A.

It is understood that the angle of the edges of the blade E can bereadily varied as desired, by swinging the blade on its pivot C,

tractor by the clamping device F. the pointer H indicating the degree ofthe desired angle. As illustrated in Fig. 6, the blade Eis made eledends and is to be adapted to be clamped to the protractor G by aclamping device F7 similarin construction to the clamping device abovementioned and shown in Figs. 1to 5. In this case angu-lar'lines can onlybe drawn on one edge of the blade E. Otherwise the construction is thesame; that is, the straight which is held a clamping plate F3 adaptedto' :to prevent the clamping'plate F3 from turn! when the latter is inthe position shown in in the shape of a straight edge having bev andthen fastening it in place on the pro- IOC edge A carries the protractorG' having a lug B carrying the pivotC, for connection with the arm D ofthe blade E.

As shown in Fig. 7 the protractor is omitted and on the straight edge A2is secured a lug B2 connected bya pivot C2 with an arm D2 of thetriangular blade E2.

As shown in Fig. 8, the protractor is omitted and in place of thetriangular blade E2 is used the blade E3 similar to the blade E', asabove described. The straight edge A3 is provided with a lug B3connected by a pivot C3 with the arm l) carrying the said blade E3.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent 1. In a drawing instrument, the combinationwith a straight edge having beveled ends, of a blade pivoted to saidstraight edge and having an edge adapted to engage the beveled end ofthe straight edge and form an angle therewith, substantially as shownand described.

2. In a drawing instrument, the combination with a straight edge havingbeveled ends, and carrying a lug, of a blade having a projecting armpivoted to the said lug, the lower surface of the blade engaging thebeveled ends of the straight edge when the blade is in its lowestposition to form an angle therewith, substantially as shown anddescribed.

3. A drawing instrument, comprising a straight edge having beveled ends,a protractor provided with a lug and rigidly secured to said straightedge, and a blade having a projecting arm pivoted to the said lug andhaving an edge adapted to engage the beveled end of the straight edgeand form an angle therewith, substantially as shown and described.

4. A drawing instrument, comprising a straight edge, a protractorprovided with a lug and rigidly secured to said straight edge, a bladehaving a downwardly projecting arm pivoted to the said lug, and havingan edge adapted to engage the endl of the straight u edge and form anangle therewith, and a fastening device substantially as described forclamping the said blade to the said protractor, as set forth.

EDMUN D L. SANDERSON. Witnesses:

H. P. FIELD, E. N. REU).

